package com.wn.ticket.web.backstage;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * @author wuqingting
 * @date 2022/8/31
 */
@Controller
@RequestMapping("/backstage")
public class CaptchaController {
    @Autowired
    private DefaultKaptcha defaultKaptcha;//来源于ConfigBean的配置

    @GetMapping(value = "/captcha")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) {
        ServletOutputStream out = null;
        try {
            response.setDateHeader("Expires", 0);
            response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
            response.addHeader("Cache-Control", "post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");
            response.setContentType("image/jpeg");
            //生成验证码
            String capText = defaultKaptcha.createText();
            HttpSession session = request.getSession();
            session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
            //向客户端写出
            BufferedImage bi = defaultKaptcha.createImage(capText);
            out = response.getOutputStream();
            ImageIO.write(bi, "jpg", out);
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
